The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 2013
Filed:
Apr. 21, 2009
Michiro Goto, Osaka, JP;
Kazuo Takemoto, Osaka, JP;
Nobuyuki Ooshima, Kyoto, JP;
Shin-ichi Haba, Kyoto, JP;
Kouichi Yoshida, Kyoto, JP;
Norio Kawai, Kyoto, JP;
Michiro Goto, Osaka, JP;
Kazuo Takemoto, Osaka, JP;
Nobuyuki Ooshima, Kyoto, JP;
Shin-ichi Haba, Kyoto, JP;
Kouichi Yoshida, Kyoto, JP;
Norio Kawai, Kyoto, JP;
Toyo Polymer Co., Ltd., Osaka, JP;
Nitta Haas Incorporated, Osaka, JP;
Abstract
The present invention provides a polyurethane foam, which, despite having a low specific gravity, has a hardness and an elasticity favorable for a polishing pad, and a polishing pad made using the polyurethane foam. The polyurethane foam is obtained by reacting a blend composition containing (A) a polyisocyanate, (B) a polyol, (C) a chain extender with a molecular weight of equal to or smaller than 400, and (D) water, and in the blend composition, MDI is blended as a main component of the component (A) and a blending amount of the MDI is 45 to 70 parts by weight when a total weight of the respective components (A), (B), and (C) is taken as 100 parts by weight.